NASA astronaut Sony Williams and Boot Wilmor were left at the International Space Station (ISS) for a period of nine months, after the Boeing Starlener capsule that carried them there.
On March 14, Spacex launched a missile carrying a new crew to ISS, as part of a plan to return astronauts to Earth.
Suni and Butch are scheduled to start on the ground two days after the new crew arrived, but the conditions on the face of the earth may delay the return.
The BBC explains how astronauts ended on the International Space Station for nine months.
Video filmed and edited by Gabriella Boccio.
Video produced by Ian Casey and Rashil Flynn.
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